Top pic is better option. If the basin waste is over 3m long, you'll need to up it to 40mm for the rest of the run. Long radius bend needed at the foot of the stack if you weren't aware.
It's max 1.7m for 32mm, max 3m for 40mm
Personally I'd do it as per the second picture, but I'd do away with the 45 near the wall penetration for the toilet and just have the 90 going through the wall.
@Adam182 this work is notifiable to Building Control so you should check what they'll be happy with before you start. You should aim for a fall of 44mm per metre on all waste & soil pipework
I do trust you are going to finish it?
I dont know what you're planning with the rainwater, but I wouldn't connect it to the stack. Downpipe will act as a vent and you risk filling your loft space with drain odours....
The new drilled outlets are very neatdo I HAVE to use a rest bend at the bottom of the soil stack?
Looking @ that reminds me when , as a young plumb I'd have 8 pints and some "blow" on a Friday night. Then on Sat. morning go to one of my Private JobsPhoto for closure, I managed to just about fit a restbend in,
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